Apparatus for the removal of sulfuric acid from water.



N0 MODEL.

' PATENTED DEG. 29, 1903.

H. REISERT. APPARATUS FOR THE REMOVAL OF SULFURIG ACID FROM WATER.

APPLIGATION FILED FEB. 3. 1902.

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. Patented December 29, 1903.

PATENT OFFICE.

HANS REISERT, OF COLOGNE, GERMANY.

APPARATUS FOR THE REMOVAL OF SULFURIC ACID FROM WATER.

SPECIFICATION forming part of Letters Patent No. 748,308, dated December29, 1903.

Application filed February 3, 1902. Serial No. 92,464. (No model.)

To aZZ whom it may concern/.- 1

Be it known that I, HANS REIsERT, a subjec of the King of Prussia,German Emperor, residing at Cologne-on-the-Rhine, in the Province of theRhine, Kingdom of Prussia, German Empire, have invented a new and usefulApparatus for the Removal of Sulfuric Acid from Water, of which thefollowing is a specification.

In my application, Serial No. 92,465, relating to a process for theremoval of sulfuric acid from water, which was filed February 3, 1902,together with the present application, there is described the method ofpassing boiler feed-water which contains calcium and magnesiumbicarbonates through a pulpy mass of pulverized barium carbonate andseparately removing the calcium and magnesium bicarbonates from thewater. An apparatus for carrying out this process is the object of thisinvention.

Reference is had to the accompanying drawing, in which a longitudinalsection of the apparatus is represented.

It is here assumed that the calcium bicarbonate is removed by means ofquicklime in the form of saturated lime-water.

The apparatus consists of the following chief parts: Awater-distributing tank a, a tank or vessel 1) for the production ofsaturated lime-water, a tank 0 for the barium-carbonate bath, and a tank01, in which the removal of the calcium and magnesium bicarbonates isefiected.

The water to be purified enters the apparatus through the pipe 71,through which it flows into the distributing-tank a. From this tank a acertain quantity of the water, which quantity is regulated by means ofthe cock 0, flows through the pipe 19 into the funnel.- shaped tank 17,which contains in its lower part hydrate of lime. In order to saturatethis water entering the tank I) with hydrate of lime, a pipe q isprovided, which leads from the distributing-tank a nearly to the bottomof the tank I). The water flowing through this pipe stirs the hydrate oflime up and.

causes the same to be more quickly dissolved in the water. Thesludgegathering at the bottom of the tank b can be removed through the pipe I.Another part of the rawv water flows through the pipes s and f into thelower part of the tank 0, passes upward through the bariu rn-carbonatebath, and through a filter g, before which, according to requirements, aclarifying apparatus is arranged and flows, clear and free from sulfuricacid, into the tank (1. Into this tank a requisite quantity of saturatedlime-water is introduced from the saturating-tank I? through the pipe'11 for the removal of the calcium and magnesium bicarbonates. The waternow passes through the tank at downward and reaches, after thedecomposition of the calcium and magnesium bicarbonates has beeneffected, the sand or gravel filter it, below which, in a well-knownmanner, a device m for pressing air through the filter for cleansingpurposes is arranged. This filter keeps-back the sludge and the waterleaves the apparatus through the pipe m. The sludge gathering at .thebottom of tank 0 can be removed through the pipe t The filter g and theclarifying apparatus h are notabsolutely essential, provided that forthe interaction of the barium carbonate and the sulfuric-acid compoundsin the water a tank 0 be used which becomes wider toward the top andwhich is sufficiently large in cross-section. It is already known thatby means of a tank which becomes wider toward the top the water can besaturated with a soluble salt in the most perfect manner, for the reasonthat the undissolved particles in the water continually sink back intothe lowest, narrowest part of the tank and are consequently againcarried upward, so that not only is complete saturation attained, butthe water on leaving the tank is also perfectly clear. A similar effectis produced when, as in the process under discussion, the bariumcarbonate is put into a tank widening toward the top and the water whichis to be freed from sulfuric acid in combination is introduced at thebottom. The interaction ICO sel d, a pipe f for leading the water to thebottom of vessel 0, means for leading the 15 water from the top ofvessel 0 to vessel (1, a vessel b for the production of saturatedlimewater, and a pipe 11 connecting the vessels 6 and d, as and for thepurpose set forth.

In testimony whereof I have signed my 20 name to this specification inthe presence of two subscribing Witnesses.

HANS REISERT.

Witnesses:

J OH. SCHOLZ, CARL SOHMITT,

